Software life cycle

Software life cycle

1. Waterfall or linear-sequential model

   • A series of steps that must be completed in a linear, sequential order.
     • Easy to use.
     • Its usefulness is limited
     • Software model
       • Analyzes the needs of the end users of the software
       • Decomposes and organizes the system, algorithms
       • the source code is implemented
       • It is checked to see if it is working properly

2. V-Shaped

   • The V-model focuses on activities and correction.
     • The relationship between the development stages and the different types of tests facilitates the troubleshooting.
     • The tests can be expensive and sometimes not effective enough.
     • Software model
       • requirements gathering, accept test
       • Funtional specifications, integration test
       • HIgh level desing, system test
       • Low level desing, unit test

3. Incremental

   • Tasks grouped in small repetitive steps.
     • The model is less likely to fail.
     • Requires a client involved throughout the course of the project.
     • Software model
       • Requirement, design, implementation and testing phases are completed for each iteration

4. Spiral

   • The risk involved in software development is taken into account.
     • Integrates development with maintenance.
     • It's an expensive model.
     • Software model
       • Planing
       • Evaluation
       • Risk analisis
       • Engineering

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